汤峪河渡槽吊杆式拱架支承结构抗震性能分析

Study on the seismic response of Tangyuhe aqueduct steeve-arch supporting structure

汤峪河渡槽采用的吊杆式拱架支承结构是国内外水工渡槽及道路工程中首创的一种工程支承结构。以汤峪河渡槽为工程实例 ,运用当今普遍采用的振型分解反应谱法和 P11D平面静力计算程序 ,分析了这种结构形式的地震反应特性。结果表明 :(1)下弦杆分缝的处理方法有效地释放了地震力所引起的结构超静定内力 ;(2 )在头道梁的拱脚附近的截面上 ,地震内力与常规荷载内力叠加后产生了巨大的偏心 ,这给结构的配筋及混凝土抗裂性要求增加了一定难度 ,设计时应重视该处截面尺寸的拟定 ,可在该处加设梗胁结构 ,加强构造配筋。

Steeve arch supporting structure adopted by Tangyuhe Aqueduct engineering is a kind of brandnew engineering bearing structure in the realm of domestic and abroad water works and highway engineering created and firstly applied by college Water Resources and Architectural of Northwest Sci Tech Univ.of Agricture and Forestry.Takeing Tangyuhe Aqueduct as an engineering example,this paper analyzes the dynamic features of this kind of structure responsing to seism by means of widely adopted vibrant type disintegration method and P11D plane-dead force calculating programme.The results of the analysis shows,on one side,the structure cracks on the bowstring rods effectively release the hyperstatical internal force in the structure caused by the seismic force;on the other side,huge eccentrical distance (1.03 meters) on the end section near the arch foot is caused by the linear addition of the seismic internal force and the internal force of the general loads,which brings some difficulties to the arrangement of the steel tendons and the anti crack requirement of concrete.So,size selections are paid more attention to when designing (e.g.,setting triangular structure on the place),and tectonic steel tendons should be strengthened.